in a vacume they are the same obviously. this question is relative to wind factors, and the precise timing mechanics of letting them "go" out of robtic controlled arm from a dcs computer, and to verify with sensitive laser continuty sensors. This actually has to be performed in a lab, and on earth, and in a facility which the time of day, temperature in the lab, atmospheric specifications, and world global physics are recorded at the instant the two figures/objects are dropped. I hope this help you. btw you are asking a question that need real time physical experimentation. it is like asking me if i flip this coin(i.e. a penny) will i get heads or tails. You have to come up with the resources, and perform the experiment your self. In otherwords...what I am "saying" go pull an experiment.
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In a vacuum, and initially in air, they would both fall at the same speed. In air though, wind resistance comes into play. The marble may reach terminal velocity at a slower speed that the Bowling ball, which has a higher mass to counteract the drag from the air. Over a long drop in air, the bowling ball would accelerate to higher speeds.